Micrel MIC69301-1.2YME Single supply vin, low vin, low vout, 3a ldo Datasheet

MIC69301/2/3
Single Supply VIN, Low VIN, Low VOUT, 3A
LDO
General Description
Features
The MIC69301/2/3 is the 3A output current member of the
• Input voltage range: VIN: 1.65V to 5.5V
MIC69xxx family of high current, low voltage regulators,
• Maximum dropout (VIN – VOUT) of 500mV
which support currents of 1A, 1.5A, 3A, and 5A. This
over temperature
family operates from a single low voltage supply, yet offers
• Adjustable output voltage down to 0.5V
high precision and ultra low dropout of 500mV under worst
• Stable with 10µF ceramic output capacitor
case conditions.
• Excellent line and load regulation
The MIC69301/2/3 operates from an input voltage of 1.65V
• Logic controlled shutdown
to 5.5V. It is designed to drive digital circuits requiring low
voltage at high currents (i.e., PLDs, DSP, microcontroller,
• Thermal shutdown and current-limit protection
etc.). These regulators are available in adjustable and
• 5-Pin TO-263
fixed output voltages. The adjustable version can support
• 5-Pin S-Pak package
output voltages down to 0.5V.
• EPAD SOIC-8 package
The µCap design of the MIC69301/2/3 is optimized for
• –40°C to +125°C junction temperature range
stability with low value low-ESR ceramic output capacitors.
Features of the MIC69301/2/3 include thermal shutdown
and current limit protection. Logic enable and error flag
Applications
pins are also available.
• Point-of-load applications
The MIC69301/2/3 is offered in TO-263, S-PAK and the
• Industrial power
EPAD SOIC-8 packages. All packages have an operating
• Sensitive RF applications
temperature range of –40°C to +125°C.
Datasheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
___________________________________________________________________________________________________________
Typical Application
Fixed 1.2V Regulator w/Error Flag Output
Adjustable Regulator
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
March 2010
M9999-030310-E
Micrel, Inc.
MIC69301/2/3
Ordering Information
Part Number
Nominal
Output Voltage
Junction
Temperature Range
Package
Lead Finish
MIC69301-1.2YME
1.2V
–40° to +125°C
8-Pin e-Pad SOIC
Pb Free
MIC69301-1.2WR
1.2V
–40° to +125°C
5-Pin S-PAK
RoHS Compliant
MIC69301-1.2WU
1.2V
–40° to +125°C
5-Pin TO-263
RoHS Compliant
MIC69302WR
Adj.
–40° to +125°C
5-Pin S-PAK
RoHS Compliant
MIC69302WU
Adj.
–40° to +125°C
5-Pin TO-263
RoHS Compliant
MIC69303YME
Adj.
–40° to +125°C
8-Pin e-Pad SOIC
Pb Free
Pin Configuration
March 2010
5-Pin TO-263 (U)
(Adjustable Voltage)
5-Pin TO-263 (U)
(Fixed Voltage with Flag)
5-Pin S-PAK (R)
(Adjustable Voltage)
5-Pin S-PAK (R)
(Fixed Voltage with Flag)
8-Pin e-Pad SOIC (ME)
(Adjustable Voltage)
8-Pin e-Pad SOIC (ME)
(Fixed Voltage with Flag)
2
M9999-030310-E
Micrel, Inc.
MIC69301/2/3
Pin Description
Pin
Number
(Fixed)
SPAK-5
TO-263-5
Pin
Number
(Adjustable)
SPAK-5
TO-263-5
Pin
Number
(Fixed)
e-Pad
SOIC-8
Pin
Number
(Adjustable)
e-Pad
SOIC-8
Pin
Name
1
1
2
2
EN
Enable (Input): CMOS compatible input. Logic high = enable,
logic low = shutdown. Do not leave pin floating.
2
2
3,4
3,4
IN
Input voltage which supplies current to the output power device.
3, TAB
3, TAB
1
1
GND
Pin Function
Ground (TAB is connected to ground on S-Pak and TO-263).
4
4
5,6
5,6
OUT
Regulator Output.
—
—
7
—
SNS
Output voltage sense. Connect to output voltage.
—
5
—
7
ADJ
Adjustable regulator feedback input. Connect to resistor voltage
divider.
5
—
8
8
FLG
Error Flag (Output): Open collector output. Active low indicates
an output fault condition.
—
—
EP
EP
March 2010
EP
Exposed pad. Connect to GND.
3
M9999-030310-E
Micrel, Inc.
MIC69301/2/3
Absolute Maximum Ratings(1)
Operating Ratings(2)
Supply Input Voltage (VIN to GND) .................. –0.3V to +6V
Logic Input Voltage (VEN to GND). .......–0.3V to (VIN + 0.3V)
Power Dissipation (PD) ........................... Internally Limited(3)
Flag ..................................................................................6V
Storage Temperature (TS).........................–65°C to +125°C
ESD(4) ............................................................................. 2kV
Supply Voltage (VIN)....................................... 1.65V to 5.5V
Enable Input Voltage (VEN)..................................... 0V to VIN
Junction Temperature (TJ) ..................–40°C ≤ TJ ≤ +125°C
Package Thermal Resistance
S-PAK-5 (θJC).......................................................2°C/W
S-PAK-5 (θJA).....................................................38°C/W
TO-263-5 (θJC) .....................................................2°C/W
EPAD SOIC-8 (θJA)............................................41°C/W
Electrical Characteristics(4)
TA = 25°C with VIN = VOUT + 1V; bold values indicate –40°C< TJ < +125°C; IOUT = 10mA; COUT = 10µF ceramic, unless noted.
Parameter
Output Voltage Accuracy
Output Voltage Line Regulation
(Note 5)
Output Voltage Load Regulation
VIN – VO; Dropout Voltage
(Note 6)
Ground Pin Current
Ground Pin Current in Shutdown
Current Limit
Start-up Time
Thermal Shutdown
Enable Input
Enable Input Threshold
Enable Pin Input Current
Conditions
Over temperature range
VIN = VOUT +1.0V to 5.5V
For VOUT ≥ 0.65V, VIN = 1.65V to 5.5V
IOUT = 10mA to 3A
IOUT = 1.5A
IOUT = 3.0A
IOUT = 10mA
IOUT = 1.5A
IOUT = 3.0A
VEN = 0V
VOUT = 0V
VEN = VIN
Min
–2
Regulator enable
Regulator shutdown
VIL ≤ 0.2V (Regulator shutdown)
VIH ≥ 0.8V (Regulator enable)
0.8
Typ
±0.2
3.3
±0.3
200
275
1.2
12
32
1
5.2
10
165
Max
+2
±0.3
300
500
5
30
75
150
0.57
Units
%
%/V
%
mV
mV
mA
mA
mA
µA
A
µs
°C
0.005
7
V
V
µA
µA
0.2
Flag Output
IFLG(LEAK)
Flag Output Leakage Current (Flag Off)
0.05
µA
VFLG(LO)
Output Logic-Low Voltage (under voltage condition),
IOUT = 5mA
Threshold, % of VOUT below nominal (falling)
Hysteresis
150
mV
VFLG
Feedback Pin Current
7.5
10
2
0.25
14
1
%
%
µA
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. The maximum allowable power dissipation of any TA (ambient temperature) is (PD(max) = TJ(max) – TA) / θJA. Exceeding the maximum allowable power
dissipation will result in excessive die temperature and the regulator will go into thermal shutdown.
4. Specification for packaged product only.
5. Minimum input for line regulation test is set to VOUT + 1V relative to the highest output voltage.
6. Dropout voltage is defined as the input-to-output differential at which the output voltage drops 2% below its nominal value measured at 1V differential.
For outputs below 1.65V, dropout voltage is considered the input-to-output voltage differential with the minimum input voltage of 1.65V. Minimum
input operating voltage is 1.65V.
March 2010
4
M9999-030310-E
Micrel, Inc.
MIC69301/2/3
Typical Characteristics
Power Supply
Rejection Ratio
70
60
1.4
1.0
200
40
0.8
150
30
VIN = 3.3V
10 VOUT = 1.8V
IOUT = 0.5A
0
1K 10K
FREQUENCY (Hz)
Dropout Voltage
vs. Temperature
400
350
IOUT = 3A
300
250
35
0.2
VOUT = 1.2V
COUT = 10µF
0.5 1.0 1.5 2.0 2.5
OUTPUT CURRENT (A)
3.0
Ground Current
vs. Output Current
IOUT = 1.5A
150
45
40
35
30
25
VOUT = 1.2V
COUT = 10µF
20 40 60 80
TEMPERATURE (°C)
50
0
15
Output Voltage
vs. Temperature
1.220
1.215
VIN = 2.2V
VOUT = 1.2V
COUT = 10µF
5
0
0
7
0.5 1.0 1.5 2.0 2.5
OUTPUT CURRENT (A)
Current Limit
vs. Temperature
VIN = 2.2V
VOUT = 1.2V
IOUT = 10mA
COUT = 10µF
20 40 60 80
TEMPERATURE (°C)
1.190
1.185
1.180
0
3
20
15
IOUT = 1.5A
10 VIN = 2.2V
5 VOUT = 1.2V
COUT = 10µF
0
20 40 60 80
TEMPERATURE (°C)
Load Regulation
1.300
1.175
2
1
IOUT = 3A
1.200
3
1.195
Ground Current
vs. Temperature
1.225
4
1.200
2.5
1.250
5
1.205
0.5
1.0
1.5
2.0
INPUT VOLTAGE (V)
1.275
6
1.210
VOUT = 1.2V
COUT = 10µF
30
25
10
100
0
0
50
20
200
1.5A
3A
0.4
50
0
0
500mA
0.6
100
20
Dropout Voltage
vs. Input Voltage
1.2
250
50
1.0
0.9
0.8
0.7
300
Dropout Voltage
vs. Output Current
VIN = 2.2V
VOUT = 1.2V
COUT = 10µF
20 40 60 80
TEMPERATURE (°C)
1.150
1.125
1.100
0
VIN = 2.2V
VOUT = 1.2V
COUT = 10µF
0.5 1.0 1.5 2.0 2.5
OUTPUT CURRENT (A)
3.0
Enable Threshold
vs. Temperature
0.6
ON
0.5
OFF
0.4
0.3 V = 2.2V
IN
0.2 VOUT = 1.2V
0.1 IOUT = 100mA
COUT = 10µF
0
20 40 60 80
TEMPERATURE (°C)
March 2010
5
M9999-030310-E
Micrel, Inc.
MIC69301/2/3
Functional Characteristics
March 2010
6
M9999-030310-E
Micrel, Inc.
MIC69301/2/3
Functional Diagram
IN
OUT
ENABLE
EN
VREF
50mV
FLG
VREF
GND
Fixed Output Regulator
IN
OUT
ENABLE
EN
0.5V
VREF
ADJ
GND
Adjustable Output Regulator
March 2010
7
M9999-030310-E
Micrel, Inc.
MIC69301/2/3
Minimum Load Current
The MIC69301/2/3 regulator is specified between finite
loads. If the output current is too small, leakage currents
dominate and the output voltage rises. A 10mA minimum
load current is necessary for proper operation.
Application Information
The MIC69301/2/3 is an ultra-high performance low
dropout linear regulator designed for high current
applications requiring a fast transient response. It utilizes
a single input supply and has a very low dropout voltage
perfect for low-voltage DC-to-DC conversion. The
MIC69301/2/3 requires a minimum number of external
components.
The MIC69301/2/3 regulator is fully protected from
damage due to fault conditions offering constant current
limiting and thermal shutdown.
Adjustable Regulator Design
The MIC69302 and MIC69303 adjustable version allows
programming the output voltage anywhere between 0.5V
and 5.5V with two resistors. The resistor value between
VOUT and the adjust pin should not exceed 10kΩ. Larger
values can cause instability. The resistor values are
calculated by:
Input Supply Voltage
VIN provides a high current to the collector of the pass
transistor. The minimum input voltage is 1.65V allowing
conversion from low voltage supplies.
⎛R
⎞
VOUT = 0.5 × ⎜⎜ 1 + 1⎟⎟
R
⎝ 2
⎠
Where VOUT is the desired output voltage.
Output Capacitor
The MIC69301/2/3 requires a minimum of output
capacitance to maintain stability. However, proper
capacitor selection is important to ensure desired
transient response. The MIC69301/2/3 is specifically
designed to be stable with low ESR ceramic chip
capacitors. A 10µF ceramic chip capacitor should satisfy
most applications. Output capacitor can be increased
without bound. See typical characteristics for examples
of load transient response.
X7R dielectric ceramic capacitors are recommended
because of their temperature performance. X7R-type
capacitors change capacitance by only 15% over their
operating temperature range and are the most stable
type of ceramic capacitors. Z5U and Y5V dielectric
capacitors change value by as much as 50% and 60%,
respectively over their operating temperature ranges. To
use a ceramic chip capacitor with Y5V dielectric the
value must be much higher than an X7R ceramic or a
tantalum capacitor to ensure the same capacitance
value over the operating temperature range. Tantalum
capacitors have a very stable dielectric (10% over their
operating temperature range) and can also be used with
this device.
Enable
The fixed output voltage versions of the MIC69301
feature an active high enable input (EN) that allows onoff control of the regulator. Current drain reduces to near
“zero” when the device is shutdown, with only
microamperes of leakage current. EN may be directly
tied to VIN and pulled up to the maximum supply voltage.
Thermal Design
Linear regulators are simple to use. The most
complicated design parameters to consider are thermal
characteristics. Thermal design requires the following
application-specific parameters:
• Maximum ambient temperature (TA)
• Output current (IOUT)
• Output voltage (VOUT)
• Input voltage (VIN)
• Ground current (IGND)
First, calculate the power dissipation of the regulator
from these numbers and the device parameters from this
data sheet.
PD = (VIN – VOUT) x IOUT + VIN x IGND
where the ground current is approximated by using
numbers from the “Electrical Characteristics” or “Typical
Characteristics” sections. The heat sink thermal
resistance is then determined with this formula:
Input Capacitor
An input capacitor of 1µF or greater is recommended
when the device is more than 4 inches away from the
bulk supply capacitance or when the supply is a battery.
Small, surface mount, ceramic chip capacitors can be
used for the bypassing. The capacitor should be placed
within 1 inch of the device for optimal performance.
Larger values will help to improve ripple rejection by
bypassing the input to the regulator further improving the
integrity of the output voltage.
March 2010
θSA = ((TJ(max) – TA)/ PD) – (θJC + θCS)
Where TJ(max) ≤125°C and θCS is between 0°C and
2°C/W.
8
M9999-030310-E
Micrel, Inc.
MIC69301/2/3
without compromising performance. When this technique
is employed, a capacitor of at least 1.0µF is needed
directly between the input and regulator ground.
Refer to “Application Note 9” for further details and
examples on thermal design and heat sink applications.
The heat sink may be significantly reduced in
applications where the minimum input voltage is known
and is large compared with the dropout voltage. Use a
series input resistor to drop excessive voltage and
distribute the heat between this resistor and the
regulator. The low dropout properties of Micrel Super
βeta PNP® regulators allow significant reductions in
regulator power dissipation and the associated heat sink
March 2010
9
M9999-030310-E
Micrel, Inc.
MIC69301/2/3
Package Information
5-Pin S-PAK (R)
5-Pin TO-263 (U)
March 2010
10
M9999-030310-E
Micrel, Inc.
MIC69301/2/3
8-Pin EPAD SOIC (ME)
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com
The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its
use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product
can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant
into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A
Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully
indemnify Micrel for any damages resulting from such use or sale.
© 2010 Micrel, Incorporated.
March 2010
11
M9999-030310-E
Similar pages